#define _CRT_SECURE_NO_WARNINGS 1
struct ListNode* FindKthToTail(struct ListNode* pListHead, int k)
{
    struct ListNode* slow, * fast;
    slow = fast = pListHead;

    while (--k)
    {
        fast = fast->next;
    }
    while (fast->next)
    {
        slow = slow->next;
        fast = fast->next;
    }
}